Neuroscientists have long believed that there are sensitive periods in development during which the effects of experience play a critical role. And developmental psychologists have argued for the importance of early experience in the first years of life as being critical for brain and behavioral development. Most of the neuroscience research…

Use of multivariate analysis (e.g., multivariate analysis of variance) is common when normally distributed outcomes are collected in intervention research. However, when mixed responses--a set of normal and binary outcomes--are collected, standard multivariate analyses are no longer suitable. While mixed responses are often obtained in…

This paper, part of an evaluation of the early intervention project at the Frank Porter Graham Child Development Center, deals primarily with results of the Bayley Mental Development Index (MDI). The MDI was administered to experimental and control infants from lower socioeconomic background at 6, 12 and 18 months of age. Results (discussed in…